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Description
The Version 4.0 Aura Ozone Monitoring Instrument (OMI) Nitrogen Dioxide (NO2) Standard Product (OMNO2) is now available from the NASA Goddard Earth Sciences Data and Information Services Center. The major V4.0 updates include: (1) use of a new daily and OMI field of view specific geometry dependent surface Lambertian Equivalent Reflectivity (GLER) product in both NO2 and cloud retrievals; (2) use of improved cloud parameters (effective cloud fraction and cloud optical centroid pressure) from a new cloud algorithm (OMCDO2N) that are retrieved consistently with NO2 using a new algorithm for O2-O2 slant column data and the GLER product for terrain reflectivity; (3) use of a more accurate terrain pressure calculated using OMI ground pixel-averaged terrain height and monthly mean GMI terrain pressure; and (4) improved treatment over snow/ice surfaces by using the concept of scene LER and scene pressure. The details can be found in the updated OMNO2 readme document (see Documentation). The OMNO2 product contains slant column NO2 (total amount along the average optical path from the sun into the atmosphere, and then toward the satellite), the total NO2 vertical column density (VCD), the stratospheric and tropospheric VCDs, air mass factors (AMFs), scattering weights for calculation of AMFs, and other ancillary data. The short name for the Level-2 swath type column NO2 products is OMNO2. Other OMNO2-associated NO2 products include the Level-2 gridded column product, OMNO2G, and the Level-3 gridded column product, OMNO2d.
The OMNO2 files are stored in version 5 EOS Hierarchical Data Format (HDF-EOS5). Each Level-2 file contains data from the day lit portion of an orbit (~53 minutes). There are approximately 14 orbits per day. The maximum file size for the OMNO2 is ~24 MB.
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Terrestrial Information Systems Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/GESDI
Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.
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Krotkov, N. A., & Veefkind, P. (2012). OMI/Aura Nitrogen Dioxide (NO2) Total and Tropospheric Column 1-orbit L2 Swath 13x24 km [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/AURA/OMI/DATA2017 Date Accessed: 2026-05-12
Krotkov, Nickolay A., and Pepijn Veefkind. “OMI/Aura Nitrogen Dioxide (NO2) Total and Tropospheric Column 1-Orbit L2 Swath 13x24 Km.” NASA Goddard Earth Sciences Data and Information Services Center, 2012. doi:10.5067/AURA/OMI/DATA2017. Date Accessed: 2026-05-12
Krotkov, Nickolay A., and Pepijn Veefkind. OMI/Aura Nitrogen Dioxide (NO2) Total and Tropospheric Column 1-Orbit L2 Swath 13x24 Km. NASA Goddard Earth Sciences Data and Information Services Center, 2012, doi:10.5067/AURA/OMI/DATA2017. Date Accessed: 2026-05-12
Cooper, Matthew J., Martin, Randall V., Hammer, Melanie S., Levelt, Pieternel F., Veefkind, Pepijn, Lamsal, Lok N., Krotkov, Nickolay A., Brook, Jeffrey R., McLinden, Chris A.
Li, M., McDonald, B. C., McKeen, S. A., Eskes, H., Levelt, P., Francoeur, C., Harkins, C., He, J., Barth, M., Henze, D. K., Bela, M. M., Trainer, M., de Gouw, J. A., Frost, G. J.
Li, Jianfeng, Wang, Yuhang, Zhang, Ruixiong, Smeltzer, Charles, Weinheimer, Andrew, Herman, Jay, Boersma, K. Folkert, Celarier, Edward A., Long, Russell W., Szykman, James J., Delgado, Ruben, Thompson, Anne M., Knepp, Travis N., Lamsal, Lok N., Janz, Scott J., Kowalewski, Matthew G., Liu, Xiong, Nowlan, Caroline R.
Zakharova, Svetlana A., Davydova, Marina A., Borovski, Alexander N., Shukurov, Karim A., Mukhartova, Yulia V., Makarenkov, Aleksandr A., Postylyakov, Oleg V.
Liu, Fei, Duncan, Bryan N., Krotkov, Nickolay A., Lamsal, Lok N., Beirle, Steffen, Griffin, Debora, McLinden, Chris A., Goldberg, Daniel L., Lu, Zifeng
Liu, Fei, Page, Aaron, Strode, Sarah A., Yoshida, Yasuko, Choi, Sungyeon, Zheng, Bo, Lamsal, Lok N., Li, Can, Krotkov, Nickolay A., Eskes, Henk, van der A, Ronald, Veefkind, Pepijn, Levelt, Pieternel F., Hauser, Oliver P., Joiner, Joanna
The table below lists the variables contained within a single granule for this
dataset. Variables often contain observed or derived geophysical measurements
collected from a variety of sources, including remote sensing instruments on
satellite and airborne platforms, field campaigns, in situ measurements, and
model outputs. The terms variable, parameter, scientific data set, layer, and band
have been used across NASA’s Earth science disciplines; however, variable is the
designated nomenclature in NASA’s Common Metadata Repository (CMR).
Variable metadata attributes such as Name, Description, Units, Data Type, Fill
Value, Valid Range, and Scale Factor allow users to efficiently process and analyze
the data. The full range of attributes may not be applicable to all variables.
Additional information on variable attributes is typically available in the data,
user guide, and/or other product documentation.
For questions on a specific variable, please use the Earthdata Forum.